<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr" v-for="item in fruitList" :key="item.id" :class="{ active: item.isChecked }">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td"> {{item.price}} </div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="item.num--" :disabled="item.num <= 1"> - </button>
                <span class="my-input__inner"> {{ item.num }} </span>
                <button class="increase" @click="item.num++"> + </button>
              </div>
            </div>
            <div class="td"> {{ item.num * item.price }} </div>
            <div class="td" @click="fn(item.id)"><button>删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isArr" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price"> {{ totalPrice }} </span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalCount }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty">🛒空空如也</div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        fruitList: JSON.parse(localStorage.getItem('list')) || [],
  
      },
      methods: {
        fn(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        }
      },
      computed: {
        // isAll() {
        //   // 统计所有小选框的状态, 都是 true 到时候返回 true, 只要有一个 false 就返回 false
        //   return this.fruitList.every(item => item.isChecked)
        // }
        isArr: {
          get() {
            return this.fruitList.every(item => item.isChecked)

          },
          set(val) {
            this.fruitList.forEach(item => item.isChecked = val)

          }

        },
        totalPrice() {
          return this.fruitList.reduce((sum, item) => {
            // 这一次求和有逻辑:
            // 必须要勾选了才计算累加
            if (item.isChecked) {
              return sum + item.price * item.num
            }
            return sum
          }, 0)
        },
        totalCount() {
            return this.fruitList.reduce((sum, item) => {
              // 这一次求和有逻辑:
              // 必须要勾选了才计算累加
              if (item.isChecked) {
                return sum + item.num
              }
              return sum
            }, 0)
          }
        },
        watch: {
          // 深度侦听
          fruitList: {
            deep: true,
            handler() {
              // console.log('数组变了')
              localStorage.setItem('list', JSON.stringify(this.fruitList))
            }
          }
      }
    })
  </script>
</body>

</html>